Pilot production of steel slag masonry blocks

Abstract

Masonry blocks are usually made of Portland cement and cured by steam. This study explores the possibility of making masonry blocks using steel slag as binder and carbon dioxide as curing activator. By carbonation activation of steel slag blocks, carbon dioxide can be permanently sequestered in steel slag as calcium carbonates, leading to stronger and more durable construction blocks. In this paper, carbonated steel slag paste was first evaluated by thermogravimetry, derivative thermogravimetry, X-ray diffraction, carbon uptake, strength development and leaching tests. Based on the preliminary results, the full-size masonry blocks were fabricated using steel slag as the binder and granite as the aggregates. The physical properties and durability of full-size steel slag masonry blocks were then examined through their density, water absorption, moisture content, compressive strength and fire resistance. An economic analysis was performed and a carbon dioxide utilization capacity was estimated. This study demonstrates that production of steel slag masonry blocks by carbonation is an economically feasible way to utilize carbon dioxide.

Development and Characterization of 3D-Printed Cementitious Sytems for Innovative Nuclear Systems

“…• Use of industrial byproducts as raw materials can reduce the production cost (Mahoutian, Chaallal, and Shao 2018).…”

“…Remaining pink color in some specimens even after 14 days of carbonation indicates incomplete carbonation due to resistance to CO2 penetration. The CO2 uptake can be determined by weighing the specimen during the carbonation (Mahoutian, Chaallal, and Shao 2018). Other indirect methods to analyze the efficiency of carbonation are thermogravimetric analysis (TGA) and x-ray diffraction (XRD).…”

Clinker-free carbonate-bonded (CFCB) products prepared by accelerated carbonation of steel furnace slags: A parametric overview of the process development

“…Therefore, direct comparison of the compressive strengths may be deceptive. Such variation can be observed from the studies performed on cube of 1 m size [110], blocks of size 300x100x50 mm and 100x100x250 [50], paste blocks of 127x76x12 mm and masonry blocks of size 400x200x200 mm [69], cylinders of 23mm diameter with ~20mm height [46], round(ish) aggregates of varying sizes [82],…”

110th Anniversary: Carbon Dioxide and Chemical Looping: Current Research Trends

“…Indeed, in recent years the number of start-up companies envisaging to close the carbon loop using renewable energy and CO 2 as a feedstock has surged. Carbicrete , however, aims to reduce the carbon footprint of the construction sector by combining mineral waste and CO 2 carbonation in a novel way of curing concrete without making use of cement. − …”